Question 1

Hydrogen peroxide decomposes to produce water and oxygen.Which of the following statements is NOT correct? 2H₂O₂ (l) $\rightarrow$2H₂O(l) + O₂ (g)

Accepted Answer

The products of the reaction are water (a liquid) and oxygen (a gas), so not all products are liquids.

Question 2

The combustion of butane (C₄H₁₀) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

Accepted Answer

C

Question 3

Which statement about a balanced chemical reaction equation is always correct?

Accepted Answer

The law of conservation of mass dictates that in a chemical reaction, the number of atoms of each element must remain constant throughout the reaction, meaning the number of atoms for each element in the reactants must equal the number of atoms for those elements in the products.

Question 4

Air bags in cars inflate when an electrical spark activates sodium azide (NaN ₃) so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation, how many moles of N₂ gas are formed for each mole of NaN₃?

Accepted Answer

The balanced chemical equation for the decomposition of sodium azide (NaN₃) is 2 NaN₃ → 2 Na + 3 N₂. This shows that 3 moles of N₂ gas are produced from 2 moles of NaN₃, which means 1.5 moles of N₂ are produced per mole of NaN₃.

Question 5

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$2 NH₃ (g)

Accepted Answer

The answer of Which statement about the following chemical reaction...

Question 6

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Accepted Answer

Sulfur dioxide (SO2) reacts with water (H2O) to form sulfurous acid (H2SO3). The reaction is as follows: SO2 + H2O → H2SO3. Therefore, the product is one molecule of sulfurous acid.

Question 7

Which relationship regarding the quantities of reactants and products associated with the following reaction is NOT correct? 6H₂ O(l) + P₄ O₁₀ (s) $\rightarrow$ 4 H₃ PO₄ (aq)

Accepted Answer

The stoichiometry of the reaction is 6:1:4, so 18 mol of H2O would require 3 mol of P4O10, not 6 mol, to produce 12 mol of H3PO4.

Question 8

Which statement regarding photosynthesis is FALSE?
 In the process of photosynthesis,

Accepted Answer

Water is not produced during photosynthesis; instead, it is consumed along with carbon dioxide to produce glucose and oxygen.

Question 9

Which statement regarding the carbon cycle is FALSE?

Accepted Answer

Combustion, including the burning of fossil fuels and biomass, consumes oxygen and produces carbon dioxide, not the other way around. This process adds carbon dioxide to the atmosphere, contributing to the greenhouse effect and global warming, rather than producing atmospheric oxygen.

Question 10

What are the stoichiometric coefficients for oxygen and water, respectively, in the balanced chemical reaction equation representing the combustion of butane (C ₄H₁₀)?

Accepted Answer

The balanced chemical equation for the combustion of butane (C4H10) is 2C4H10 + 13O2 → 8CO2 + 10H2O. Thus, the stoichiometric coefficients for oxygen and water are 13 and 10, respectively.

Question 11

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$2 NH₃ (g)

Accepted Answer

The balanced chemical equation shows that for every one mole of nitrogen consumed, two moles of ammonia are produced, not three.

Question 12

The acid-base reaction between phosphoric acid, H ₃PO₄, and calcium hydroxide, Ca(OH)₂, yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction, how many moles of water are produced?

Accepted Answer

The balanced chemical equation for the reaction between phosphoric acid (H₃PO₄) and calcium hydroxide (Ca(OH)₂) to produce calcium phosphate (Ca₃(PO₄)₂) and water (H₂O) is: 2H₃PO₄ + 3Ca(OH)₂ → Ca₃(PO₄)₂ + 6H₂O. This shows that for each mole of calcium phosphate produced, 6 moles of water are produced.

Question 13

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂ O₂ (l) $\rightarrow$ 2H₂ O(l) + O₂ (g)

Accepted Answer

The correct answer is D because the relationship between the quantities of reactants and products is not balanced. The equation should be:2H₂O₂ (l) → 2H₂O(l) + O₂ (g)

Question 14

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂O₂ (l) $\rightarrow$ 2 H₂O(l) +O₂(g)

Accepted Answer

The mass relationship in option E is incorrect because the mass of reactants should equal the mass of products. 2 g of hydrogen peroxide cannot produce 2 g of water and 1 g of oxygen, as this would violate the law of conservation of mass.

Question 15

In an aqueous solution under basic conditions, ozone (O₃) reacts with iodide (I^-) and water to form iodine (I₂), hydroxide (OH^-), and oxygen (O₂).What is the sum of the stoichiometric coefficients in the balanced reaction equation? O₃(g) + I^-(aq) + H₂O(l) $\rightarrow$ I₂ (aq) + OH^-(aq) + O₂(g)

Accepted Answer

The answer of In an aqueous solution under basic conditions,...

Question 16

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C₈ H₁₈ (l) +O₂ (g) $\rightarrow$ CO₂ (g) + H₂ O(l)

Accepted Answer

The coefficients that balance the reaction equation are: 2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O(l).

Question 17

Which statement about the following chemical reaction is NOT correct? The molar masses of S₈, O₂, and SO₃ are 256, 32.0, and 80.1 g/mol, respectively. S₈ (s)+ 12 O₂ (g) $\rightarrow$ 8 SO₃ (g)

Accepted Answer

The answer of Which statement about the following chemical reaction...

Question 18

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

Accepted Answer

The answer of One form of elemental sulfur is a...

Question 19

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?

Accepted Answer

When one molecule of SO₃ reacts with one molecule of water, it forms one molecule of sulfuric acid (H2SO4).

Question 20

Fe₂O₃(s) and powdered aluminum can react with great output of heat to form molten iron and Al ₂O₃.When this reaction equation is balanced, what are the stoichiometric coefficients in the following order: Fe₂O₃, Al, Fe, Al₂O₃?

Accepted Answer

The balanced equation for the reaction between iron(III) oxide (Fe2O3) and aluminum (Al) to produce iron (Fe) and aluminum oxide (Al2O3) is: Fe2O3 + 2Al → 2Fe + Al2O3. This shows the stoichiometric coefficients are 1 for Fe2O3, 2 for Al, 2 for Fe, and 1 for Al2O3.

Quiz 7: Stoichiometry Mass Relationships and Chemical Reactions

Hydrogen peroxide decomposes to produce water and oxygen.Which of the following statements is NOT correct? 2H₂O₂ (l) $\rightarrow$ 2H₂O(l) + O₂ (g)

The combustion of butane (C₄H₁₀) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

Which statement about a balanced chemical reaction equation is always correct?

Air bags in cars inflate when an electrical spark activates sodium azide (NaN ₃) so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation, how many moles of N₂ gas are formed for each mole of NaN₃?

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$ 2 NH₃ (g)

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Which relationship regarding the quantities of reactants and products associated with the following reaction is NOT correct? 6H₂ O(l) + P₄ O₁₀ (s) $\rightarrow$ 4 H₃ PO₄ (aq)

Which statement regarding photosynthesis is FALSE? In the process of photosynthesis,

Which statement regarding the carbon cycle is FALSE?

What are the stoichiometric coefficients for oxygen and water, respectively, in the balanced chemical reaction equation representing the combustion of butane (C ₄H₁₀) ?

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$ 2 NH₃ (g)

The acid-base reaction between phosphoric acid, H ₃PO₄, and calcium hydroxide, Ca(OH) ₂, yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction, how many moles of water are produced?

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂ O₂ (l) $\rightarrow$ 2H₂ O(l) + O₂ (g)

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂O₂ (l) $\rightarrow$ 2 H₂O(l) +O₂(g)

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C₈ H₁₈ (l) +O₂ (g) $\rightarrow$ CO₂ (g) + H₂ O(l)

Which statement about the following chemical reaction is NOT correct? The molar masses of S₈, O₂, and SO₃ are 256, 32.0, and 80.1 g/mol, respectively. S₈ (s) + 12 O₂ (g) $\rightarrow$ 8 SO₃ (g)

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?

Fe₂O₃(s) and powdered aluminum can react with great output of heat to form molten iron and Al ₂O₃.When this reaction equation is balanced, what are the stoichiometric coefficients in the following order: Fe₂O₃, Al, Fe, Al₂O₃?

Quiz 7: Stoichiometry Mass Relationships and Chemical Reactions

Hydrogen peroxide decomposes to produce water and oxygen.Which of the following statements is NOT correct? 2H2O2 (l) →\rightarrow→ 2H2O(l) + O2 (g)

The combustion of butane (C4H10) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

Which statement about a balanced chemical reaction equation is always correct?

Air bags in cars inflate when an electrical spark activates sodium azide (NaN 3) so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation, how many moles of N2 gas are formed for each mole of NaN3?

Which statement about the following chemical reaction is NOT correct? 3 H2 (g) + N2 (g) →\rightarrow→ 2 NH3 (g)

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO2 reacts with one molecule of water?

Which relationship regarding the quantities of reactants and products associated with the following reaction is NOT correct? 6H2 O(l) + P4 O10 (s) →\rightarrow→ 4 H3 PO4 (aq)

Which statement regarding photosynthesis is FALSE? In the process of photosynthesis,

Which statement regarding the carbon cycle is FALSE?

What are the stoichiometric coefficients for oxygen and water, respectively, in the balanced chemical reaction equation representing the combustion of butane (C 4H10) ?

Which statement about the following chemical reaction is NOT correct? 3 H2 (g) + N2 (g) →\rightarrow→ 2 NH3 (g)

The acid-base reaction between phosphoric acid, H 3PO4, and calcium hydroxide, Ca(OH) 2, yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction, how many moles of water are produced?

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H2 O2 (l) →\rightarrow→ 2H2 O(l) + O2 (g)

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H2O2 (l) →\rightarrow→ 2 H2O(l) +O2(g)

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C8 H18 (l) +O2 (g) →\rightarrow→ CO2 (g) + H2 O(l)

Which statement about the following chemical reaction is NOT correct? The molar masses of S8, O2, and SO3 are 256, 32.0, and 80.1 g/mol, respectively. S8 (s) + 12 O2 (g) →\rightarrow→ 8 SO3 (g)

One form of elemental sulfur is a ring of eight sulfur atoms.How many moles of molecular oxygen are consumed when one mole of this allotrope burns to make sulfur trioxide?

Fuming sulfuric acid is obtained by the addition of SO3 to concentrated H2SO4.The fumes result from the reaction of SO3 gas with water vapor.What is the product when one molecule of SO3 reacts with one molecule of water?

Fe2O3(s) and powdered aluminum can react with great output of heat to form molten iron and Al 2O3.When this reaction equation is balanced, what are the stoichiometric coefficients in the following order: Fe2O3, Al, Fe, Al2O3?

Hydrogen peroxide decomposes to produce water and oxygen.Which of the following statements is NOT correct? 2H₂O₂ (l) $\rightarrow$ 2H₂O(l) + O₂ (g)

The combustion of butane (C₄H₁₀) forms carbon dioxide and water.What is the stoichiometric coefficient for oxygen in the balanced equation when 1 mol of butane undergoes combustion?

Air bags in cars inflate when an electrical spark activates sodium azide (NaN ₃) so that it decomposes to sodium metal and nitrogen gas.In the balanced reaction equation, how many moles of N₂ gas are formed for each mole of NaN₃?

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$ 2 NH₃ (g)

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Which relationship regarding the quantities of reactants and products associated with the following reaction is NOT correct? 6H₂ O(l) + P₄ O₁₀ (s) $\rightarrow$ 4 H₃ PO₄ (aq)

What are the stoichiometric coefficients for oxygen and water, respectively, in the balanced chemical reaction equation representing the combustion of butane (C ₄H₁₀) ?

Which statement about the following chemical reaction is NOT correct? 3 H₂ (g) + N₂ (g) $\rightarrow$ 2 NH₃ (g)

The acid-base reaction between phosphoric acid, H ₃PO₄, and calcium hydroxide, Ca(OH) ₂, yields water and calcium phosphate.For each mole of calcium phosphate produced by this reaction, how many moles of water are produced?

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂ O₂ (l) $\rightarrow$ 2H₂ O(l) + O₂ (g)

Hydrogen peroxide decomposes to produce water and oxygen.Which relationship regarding the quantities of reactants and products associated with this reaction is NOT correct? 2H₂O₂ (l) $\rightarrow$ 2 H₂O(l) +O₂(g)

Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C₈ H₁₈ (l) +O₂ (g) $\rightarrow$ CO₂ (g) + H₂ O(l)

Which statement about the following chemical reaction is NOT correct? The molar masses of S₈, O₂, and SO₃ are 256, 32.0, and 80.1 g/mol, respectively. S₈ (s) + 12 O₂ (g) $\rightarrow$ 8 SO₃ (g)

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?

Fe₂O₃(s) and powdered aluminum can react with great output of heat to form molten iron and Al ₂O₃.When this reaction equation is balanced, what are the stoichiometric coefficients in the following order: Fe₂O₃, Al, Fe, Al₂O₃?